<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
       <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
       <title></title>
       <style type="text/css">
          *{margin:0;padding:0;}
           .layer1{width:100%; height:100px;  background:blue;color:white;text-align:center;}
           .layer2-1{width:60%; height:200px; background:yellow;text-align:center;float:left;}  
           .layer2-1-1{width:100%;height:100px;background:orange;}
           .layer2-1-2{width:100%;height:100px;background:pink;}
           .layer2-2{width:40%; height:200px; background:red;text-align:center;float:left;} 
           .layer2-3{clear:both;}   
           .layer3{width:100%; height:100px;  background:green;color:white;text-align:center;}  

       </style>
    </head>
    <body>
       <div class="layer1"><h1></h1></div>
       <div class="layer2">
            <div class="layer2-1"><h2></h2>
             <div class="layer2-1-1"><h2></h2></div>
              <div class="layer2-1-2"><h2></h2></div>
            </div>
            <div class="layer2-2"><h2></h2></div>
            <div class="layer2-3"></div>
       </div>    
       <div class="layer3"></div>
    </body>
 </html>
